Never had a problem with the two manifolds I have had.that was on my daily car both times. first one from 2009 still goin on a mates car.one for sale atm have had since march and no issues whatsoever same as standard cast manis crack and sometimes even expensive ones. Think the main issue with cheaper ones is that they arent braced. not claiming toyosports are the nuts,they are just a standard/budget well priced mani.